Dropout 层
Dropout class
tf_keras.layers.Dropout(rate, noise_shape=None, seed=None, **kwargs)
Applies Dropout to the input.
The Dropout layer randomly sets input units to 0 with a frequency of rate
at each step during training time, which helps prevent overfitting.
Inputs not set to 0 are scaled up by 1/(1 - rate) such that the sum over
all inputs is unchanged.
Note that the Dropout layer only applies when training is set to True
such that no values are dropped during inference. When using model.fit,
training will be appropriately set to True automatically, and in other
contexts, you can set the kwarg explicitly to True when calling the layer.
(This is in contrast to setting trainable=False for a Dropout layer.
trainable does not affect the layer's behavior, as Dropout does
not have any variables/weights that can be frozen during training.)
>>> tf.random.set_seed(0)
>>> layer = tf.keras.layers.Dropout(.2, input_shape=(2,))
>>> data = np.arange(10).reshape(5, 2).astype(np.float32)
>>> print(data)
[[0. 1.]
[2. 3.]
[4. 5.]
[6. 7.]
[8. 9.]]
>>> outputs = layer(data, training=True)
>>> print(outputs)
tf.Tensor(
[[ 0. 1.25]
[ 2.5 3.75]
[ 5. 6.25]
[ 7.5 8.75]
[10. 0. ]], shape=(5, 2), dtype=float32)
Arguments
- rate: Float between 0 and 1. Fraction of the input units to drop.
- noise_shape: 1D integer tensor representing the shape of the
binary dropout mask that will be multiplied with the input.
For instance, if your inputs have shape
(batch_size, timesteps, features)and you want the dropout mask to be the same for all timesteps, you can usenoise_shape=(batch_size, 1, features). - seed: A Python integer to use as random seed.
Call arguments
- inputs: Input tensor (of any rank).
- training: Python boolean indicating whether the layer should behave in training mode (adding dropout) or in inference mode (doing nothing).